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After consulting faq's and the archives i'm also suspecting the fp check valve
The check valve won't cause the problems you describe. If it's bad, it will make for longer cranking time when starting.
A shot in the dark maybe, but try cleaning up the Ground points on the intake manifold. One poster fixed an ECU/FI relay problem yesterday when he found one of those grounds loose (there are 3 places with 1 or more black wires at each one. They affect the ECU, AMM, Ignition CU, Ignition Power Stage, and O2 Sensor heater.
Oh yes, use the Model/Year Pull-Down ("ALL") under the subject line to let us know the year of your car. It could be important.
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Bruce Young, '93 940-NA (current) '80 GLE V8 (Sold 5/03) '83 Turbo 245 '76 244 (lasted only 255,000 miles) 73 142 (98K) '71 144 (track modified--crusher bound) New 144 from '67 to '78 Used '62 122 from '63 to '67
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